Relationship Between State Parameters and Thermal Properties of Cut Tobacco During Drying in Cylinder

In order to analyze the heat transfer process during tobacco heating and moistening, the thermal properties of cut tobacco during drying in a cylinder were measured with transient plane thermal source method by a self-configured online testing platform,and the effects of temperature and moisture content of cut tobacco on its thermal conductivity,thermal diffusivity and volumetric heat capacity were investigated and analyzed. The results showed that:1)At the same moisture content,the thermal conductivity and volumetric heat capacity of cut tobacco increased,while thermal diffusivity decreased with the raise of cut tobacco temperature. 2)At the same temperature,the thermal conductivity and volumetric heat capacity of cut tobacco decreased while thermal diffusivity increased with the decrease of moisture content. 3)During the process of tobacco drying, along with moisture content decreasing and temperature raising,the thermal conductivity of cut tobacco tended to decrease,which indicated that the moisture content affected thermal conductivity more significantly than did temperature.